I have a problem with the covers of my FLAC files. I use a micro SD to USB-C adapter with a full card of FLACs perfectly classified and ordered, with their metadata written. The problem comes with the covers, no matter how much I attach them correctly to the file, in the MMI they simply do not appear, or they appear replaced by those used by the Gracenote system. I have read that it could be due to a resolution issue, but I have tried making them smaller, below 600x600px and nothing... There is no correlation to know what I have to do. In some cases, such as albums that are more recent than the Gracenote database, the covers inserted in the FLAC files should appear, but generic photos of the musical style appear directly. Hope someone can help me.